131=.006A^2-.02A+120

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Solution for 131=.006A^2-.02A+120 equation:


Simplifying
131 = 0.006A2 + -0.02A + 120

Reorder the terms:
131 = 120 + -0.02A + 0.006A2

Solving
131 = 120 + -0.02A + 0.006A2

Solving for variable 'A'.

Combine like terms: 131 + -120 = 11
11 + 0.02A + -0.006A2 = 120 + -0.02A + 0.006A2 + -120 + 0.02A + -0.006A2

Reorder the terms:
11 + 0.02A + -0.006A2 = 120 + -120 + -0.02A + 0.02A + 0.006A2 + -0.006A2

Combine like terms: 120 + -120 = 0
11 + 0.02A + -0.006A2 = 0 + -0.02A + 0.02A + 0.006A2 + -0.006A2
11 + 0.02A + -0.006A2 = -0.02A + 0.02A + 0.006A2 + -0.006A2

Combine like terms: -0.02A + 0.02A = 0.00
11 + 0.02A + -0.006A2 = 0.00 + 0.006A2 + -0.006A2
11 + 0.02A + -0.006A2 = 0.006A2 + -0.006A2

Combine like terms: 0.006A2 + -0.006A2 = 0.000
11 + 0.02A + -0.006A2 = 0.000

Begin completing the square.  Divide all terms by
-0.006 the coefficient of the squared term: 

Divide each side by '-0.006'.
-1833.333333 + -3.333333333A + A2 = 0

Move the constant term to the right:

Add '1833.333333' to each side of the equation.
-1833.333333 + -3.333333333A + 1833.333333 + A2 = 0 + 1833.333333

Reorder the terms:
-1833.333333 + 1833.333333 + -3.333333333A + A2 = 0 + 1833.333333

Combine like terms: -1833.333333 + 1833.333333 = 0.000000
0.000000 + -3.333333333A + A2 = 0 + 1833.333333
-3.333333333A + A2 = 0 + 1833.333333

Combine like terms: 0 + 1833.333333 = 1833.333333
-3.333333333A + A2 = 1833.333333

The A term is -3.333333333A.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333A + 2.777777779 + A2 = 1833.333333 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333A + A2 = 1833.333333 + 2.777777779

Combine like terms: 1833.333333 + 2.777777779 = 1836.111110779
2.777777779 + -3.333333333A + A2 = 1836.111110779

Factor a perfect square on the left side:
(A + -1.666666667)(A + -1.666666667) = 1836.111110779

Calculate the square root of the right side: 42.849867103

Break this problem into two subproblems by setting 
(A + -1.666666667) equal to 42.849867103 and -42.849867103.

Subproblem 1

A + -1.666666667 = 42.849867103 Simplifying A + -1.666666667 = 42.849867103 Reorder the terms: -1.666666667 + A = 42.849867103 Solving -1.666666667 + A = 42.849867103 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + A = 42.849867103 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + A = 42.849867103 + 1.666666667 A = 42.849867103 + 1.666666667 Combine like terms: 42.849867103 + 1.666666667 = 44.51653377 A = 44.51653377 Simplifying A = 44.51653377

Subproblem 2

A + -1.666666667 = -42.849867103 Simplifying A + -1.666666667 = -42.849867103 Reorder the terms: -1.666666667 + A = -42.849867103 Solving -1.666666667 + A = -42.849867103 Solving for variable 'A'. Move all terms containing A to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + A = -42.849867103 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + A = -42.849867103 + 1.666666667 A = -42.849867103 + 1.666666667 Combine like terms: -42.849867103 + 1.666666667 = -41.183200436 A = -41.183200436 Simplifying A = -41.183200436

Solution

The solution to the problem is based on the solutions from the subproblems. A = {44.51653377, -41.183200436}

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